Element profiles and Ir concentration of Cretaceous-Tertiary (K-T) boundary layers at Medetli, Goelpazari, northwestern Turkey

Arakawa, Yoji; Li, Xin; Ebihara, Mitsuru; Merıç, Engin; Tansel, Izavel; Koral, Hayrettin; Matsumaru, Kuniteru

doi:10.2343/geochemj.37.681

Cited by 3 publications

(3 citation statements)

References 38 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(B) Values at Blackwater Draw, New Mexico, USA, rise before the peak in the YDB layer and decline afterward. (C) At Medetli, Turkey, values peak near the K-T impact layer, and then declined sharply(Arakawa et al, 2003). (D) At Massignano, Italy, values reach peaks just above the impact layer caused by the Eocene Chesapeake Bay impact, rising and falling just before and after.…”

Section: Iridium and Platinum And Their Interpretationmentioning

confidence: 99%

See 1 more Smart Citation

A multi-proxy study of changing environmental conditions in a Younger Dryas sequence in southwestern Manitoba, Canada, and evidence for an extraterrestrial event

et al. 2019

View full text Add to dashboard Cite

Multi-proxy analyses of a sequence spanning the Younger Dryas (YD) in the Glacial Lake Hind basin of Manitoba provides insight into regional paleohydrology and paleovegetation of meltwater rivers and lakes spanning >4000 yr; the sequence is controlled by 25 new accelerator mass spectrometry ages. This lake, dammed by the Laurentide Ice Sheet, overflowed into Lake Agassiz. The pre-YD interval records rapid sedimentation from meltwaters that headed in proglacial lakes in the Canadian Prairies that are known to have been catastrophically released when ice or sediment barriers were breached. Pollen in this phase is dominated by pre-Quaternary forms eroded from Paleocene bedrock. At the onset of the YD at ~12.8 cal ka, the sudden appearance of concentrations of nanodiamonds, high-temperature magnetic spherules, platinum, and iridium provide evidence of an extraterrestrial (ET) event that others have identified at more than 40 sites in North America. Major changes in oceans and climate, and the catastrophic outflow of nearby Lake Agassiz at the onset of the YD, may be related. Lower water levels and a reduction of Souris River inflow to Lake Hind followed, which are reflected by more clayey and organic-rich sediments and a decrease in pre-Quaternary palynomorphs. This may have resulted from the deepening of river valleys caused by the release of meltwater triggered by the ET event. Wetlands then began to develop, leading to peat deposition from 12.3 to 11 cal ka. This was followed by a fluvial episode depositing sand and then by increased Holocene aridity that resulted in accumulation of a thick sequence of dune sands. A dry woodland environment with a mix of conifers (especially Picea and Larix) and deciduous trees (especially Populus and Quercus) covered the uplands from ~13 to 10 cal ka.

show abstract

Section: Iridium and Platinum And Their Interpretationmentioning

confidence: 99%

“…11). Patterns of multiple spikes were observed in and/or above the cosmic impact layers at Blackwater Draw, New Mexico (YDB event) and at Medetli, Turkey (K-T; Arawaka et al, 2003). At Massignano, Italy, a similar pattern of elemental peaks occurs immediately above the Eocene impact layer (Fig.…”

Section: Other Elemental Anomaliesmentioning

confidence: 99%

A multi-proxy study of changing environmental conditions in a Younger Dryas sequence in southwestern Manitoba, Canada, and evidence for an extraterrestrial event

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The most detailed study of impact-related biomass burning (Ebihara and Miura 1996) is of the 66-My-old Cretaceous-Tertiary boundary (K-Pg) event, which produced a discrete layer with peak abundances of numerous impact-related proxies, including extraterrestrial iridium and platinum (Arakawa et al 2003). Although there is some debate about the magnitude of K-Pg biomass burning (Belcher et al 2003;Robertson et al 2013), the evidence includes concentration peaks in AC/soot (Wolbach 1990), charcoal (Robertson et al 2013), carbon spherules (Adatte et al 2005), annealed organic matter in framboidal pyrite (Mahaney 2002), and aerosol-and gas-phase polycyclic aromatic hydrocarbons (PAHs; Arinobu et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Extraordinary Biomass-Burning Episode and Impact Winter Triggered by the Younger Dryas Cosmic Impact ∼12,800 Years Ago. 2. Lake, Marine, and Terrestrial Sediments

Wolbach¹,

Ballard²,

Mayewski³

et al. 2018

The Journal of Geology

View full text Add to dashboard Cite

A B S T R A C TPart 1 of this study investigated evidence of biomass burning in global ice records, and here we continue to test the hypothesis that an impact event at the Younger Dryas boundary (YDB) caused an anomalously intense episode of biomass burning at ∼12.8 ka on a multicontinental scale (North and South America, Europe, and Asia). Quantitative analyses of charcoal and soot records from 152 lakes, marine cores, and terrestrial sequences reveal a major peak in biomass burning at the Younger Dryas (YD) onset that appears to be the highest during the latest Quaternary. For the Cretaceous-Tertiary boundary (K-Pg) impact event, concentrations of soot were previously utilized to estimate the global amount of biomass burned, and similar measurements suggest that wildfires at the YD onset rapidly consumed ∼10 million km 2 of Earth's surface, or ∼9% of Earth's biomass, considerably more than for the K-Pg impact. Bayesian analyses and age regressions demonstrate that ages for YDB peaks in charcoal and soot across four continents are synchronous with the ages of an abundance peak in platinum in the Greenland Ice Sheet Project 2 (GISP2) ice core and of the YDB impact event (12,835-12,735 cal BP). Thus, existing evidence indicates that the YDB impact event caused an anomalously large episode of biomass burning, resulting in extensive atmospheric soot/dust loading that triggered an "impact winter." This, in turn, triggered abrupt YD cooling and other climate changes, reinforced by climatic feedback mechanisms, including Arctic sea ice expansion, rerouting of North American continental runoff, and subsequent ocean circulation changes.

show abstract

Geological age of the Sashida Limestone in south Izu region, Japan based on microfossils

Matsumaru

Yagi

2022

J. Petroleum Tech.

Self Cite

View full text Add to dashboard Cite

Geological age of theSashida Limestone in south Izu region, Japan based on microfossils -New knowledge about the geohistor y of the Izu Peninsula (Part 1) Kuniteru Matsumaru and Masahiko YagiAbstract： The late Cretaceous, Paleocene, late Middle to Late Eocene, Oligocene and early Early Miocene larger (benthonic) and planktonic foraminifera were con rmed for the rst time, in addition to Early-Middle Miocene larger foraminifera, from the Sashida Limestone included basalt pebbles beside the outcrop, which was covered by riverconstruction, and near there, Sashida, Kamo-Gun, south Izu Peninsula, Japan. The Sashida Limestone consists of clastic carbonate rocks of various ages from the late Cretaceous through early Early Miocene to late Miocene or early Pliocene. From the research conclusion, the geology and geohistory of the Cretaceous-Paleogene Shimanto Group and Paleogene Setogawa Group along the Paci c Ocean as the pre-Yugashima Group, and the locus of lateral mobility of the Izu landmass of the antecedent of the Izu Peninsula were indicated as further research.

show abstract

Element profiles and Ir concentration of Cretaceous-Tertiary (K-T) boundary layers at Medetli, Goelpazari, northwestern Turkey

Cited by 3 publications

References 38 publications

A multi-proxy study of changing environmental conditions in a Younger Dryas sequence in southwestern Manitoba, Canada, and evidence for an extraterrestrial event

A multi-proxy study of changing environmental conditions in a Younger Dryas sequence in southwestern Manitoba, Canada, and evidence for an extraterrestrial event

Extraordinary Biomass-Burning Episode and Impact Winter Triggered by the Younger Dryas Cosmic Impact ∼12,800 Years Ago. 2. Lake, Marine, and Terrestrial Sediments

Geological age of the Sashida Limestone in south Izu region, Japan based on microfossils

Contact Info

Product

Resources

About